The Doctor turned and began to walk back to her TARDIS. "What, that's it? Aren't you forgetting something?" River asked, his voice playful as he leaned against the door of his cell. The Doctor turned around confused. She began to walk back. "I don't think so-" She began to say before River placed a finger over her mouth in order to shush her. "Oh, shut up." The blonde man told her as his lips crashed into hers. The Doctor's eyes went wide as River placed one hand on her lower back pulling her closer. The Time Lord fidgeted and awkwardly tried to find someplace to put her hands, but didn't want to break the kiss. She ultimately gave up and placed one of her hands on River's shoulder blade nervously. River pulled away slowly. The Doctor, still shocked, felt her vocabulary escape her. "Well, that was... unexpected." She stated breathlessly. "You mean we've never done that before?" River questioned in a tone that bordered between shock and sadness. The alien woman backed away towards the TARDIS, not taking her eyes off of River. "No... But it was... nice..." The Doctor told him shakily. She then turned around and darted into the TARDIS. As soon as she shut the doors, she leaned against them, and placed her fingertips to her lips. They still tingled from the kiss. "Who are you to me?" She asked River, although she knew he couldn't hear her. "Who are you...?"